Check your muffler for cloggage. Does any gas come out of the sp plug hole when it is removed? Could have water in the crank case.
If you replaced the recoil starter and it's still binding then likely it's an internal engine bearing failure.
Try removing the recoil starter and see if you can turn the engine with a m8 socket wrench over the nut inside the starter cup.
If you can't turn it with a wrench then you'll need to try turning the impeller fan and/or remove the impeller to be sure nothing on the fan side is causing issues, though not likely since engine spins with spark plug removed.
If you cant get it to turn after trying the above. Then likely you have a shaft and/or rod bearing failure that is seizing under compression load.
I guess the spark plug is bad. The most common cause of poor acceleration on most vehicles is a problem in the ignition system
Or maybe due to poor fuel economy
SOURCE: Unable to pull starter cord at all
pour some gas/oil mixture down sparkplug hole and let it soak and see if the rings are carbon blocked
SOURCE: my mcculloch petrol hedgetrimmer wont start
The fact that your engine turns over easily with the spark plug removed simply means that, with the plug removed, there is no compression, so the piston goes up and down very easily.
If it has been a while since you ran the machine, and if you left gas in it, your carb may have gotten gummed up from the gas losing it viability and turning to something like varnish. You might try spraying carb cleaner into the carb (with the air filter removed), let it sit for a few minutes, then try starting. In the future, you probably should get some fuel stablizer (available at almost any hardware store) and add it to the fuel that you use for your small machines. It will keep the gas viable for a much longer period of time.
Hope that you are lucky enough that the carb cleaner, a good dose, will work. If not, you may have to disassemble and clean out your carb. (if you've never done that, a series of digital camera photos so you know where to put things back is a good idea).
SOURCE: Ryobi Chainsaw won't turn. removed pull cord
Starter Handle difficult to pull:
1. Remove the starter cover.
· Inspect the flywheel and crankshaft under the starter cover. Are the woodruff key slots on the crack shaft and flywheel aligned and the key intact? If not; Please consider taking the saw to a good local saw seller/mechanic for a written diagnosis before authorizing any repair, if yes continue.
· Does the starter operate smoothly? If yes, reinstall the cover and continue with 2, if not repair the starter.
2. Is the saw equipped with a decompression valve? Yes continue, no proceed with 3.
· Leave the ignition off, set the valve and pull the starter.
· Pull gently to release the valve. Is there a difference in the effort required?
· If yes continue with 3, if no repair or replace the decompression valve.
3. Was this saw perhaps operated in a lean condition (metal transfer from the piston to cylinder wall)? This may be caused by many things including but not limited to; leaky intake connections at the engine or carburetor; leaky crankcase seals; cracked fuel delivery lines; running on gasoline containing no 2-cycle oil.
· Disconnect the spark plug wire and remove the plug. Remove the muffler (clean it and the spark arrestor before reinstalling), hold a light at the plug hole and inspect the cylinder through the exhaust port. Is it smooth and shiny or does it appear speckled with dull gray spots or smears?
· Pull the starter slowly, inspect the piston as it rises and falls. Is it a dull gray without scratches and gouges?
· Hold the light at the exhaust port and look through the spark plug hole, inspect the cylinder above the exhaust port. Is it shiny and smooth or speckled with gray spots or smears?
Please Note: Any spots or smears on the cylinder or deep scratches and gouges in the piston indicate the saw was operated in a lean condition. Repair of this on a home owner quality saw often exceeds replacement cost. A repair estimate by an independent saw shop should be considered.
If you have more questions or need additional help please reply below and I will get back to you. Thank you for using FixYa and Good Luck. HTH
Lou
SOURCE: the lawnmower won t start after pulling the start
try a touch of starting fluid right into the carburator by taking the air filter off. If it then starts but wont run or stay running, the reservoir below the carb should be removed to clean at and the pinhole in the intake tube above the bowl nut. This is the most common problem with lawnmower start problems, the pinhole can be unplugged with one wire from a wire brush. Be careful with the gas, at least pinch off the gas hose with a vise grips while removing the carb bowl.. Never use a droplight around gasoline.
SOURCE: My pull cord on my Stihl gas backpack won,t pull out unless i have taken out thesparkplug
This tells me the cylinder is full of gas from needle sticking open in carb,causing it to siphon fuel in from tank when shut off, a bad cap or fuel vent will also cause this. need to tip upside down and pull rope several times with spark plug out to get all the fuel out of crankcase/and cylinder....This is causing hydrolock.
826 views
Usually answered in minutes!
×